What the statute says — and the word it never uses
The priority hierarchy ranks legal guardian, then parent, then adult sibling, then grandparent — and the parent rank is shared equally by both legal parents. The word the statute never uses is custody: a parent with every-other-weekend visitation holds exactly the rank of the parent with primary physical custody. Non-custodial is not non-parent for this program, and neither parent needs the other’s permission to file.
What breaks ties within the rank is timing: the first valid election generally stands, and a second filing triggers the duplicate-flag process that freezes progress for weeks — the exact scenario separated households produce when each parent independently decides to be responsible the same month. The two facts to hold together: either of you may file, and exactly one of you should.
What the opener actually gets (and what they don’t)
Deflate the stakes first: the opener gets clerical powers, not the money. The account belongs to the child from day one, nothing exits during the growth period, no parent can withdraw a dollar for any purpose in any custody arrangement, and at conversion the whole thing becomes the young adult’s IRA regardless of whose name signed the form. Neither household can raid it; that is the design’s quiet gift to high-conflict situations.
What the opener does hold is visibility and administration: the registration email anchors the official app credentials — the window into balances, deposits, and eventually investment elections — plus the practical role of fixing problems and receiving notices. Real but modest. The parent who lost the filing race has lost an app login, not a child’s future; and credential-sharing (next section) recovers even that.
The coordination menu, from amicable to armored
Amicable version: one text — I’ll file the Trump Account paperwork unless you’d rather; either way let’s share the login. One parent files per the opening guide, credentials live where both can see (shared password entry, or simply both knowing the email), contributions from both households get logged through one cap-tracking coordinator. Done; the program never notices your divorce.
Structured version: for households that write things down, two sentences in the parenting-plan addendum settle it forever — who files, and that both parents receive account visibility and contribution records annually. Armored version: where communication routes through lawyers anyway, add the account to the existing machinery: the filing parent designated in the order, records exchanged with the other financial disclosures. The statute doesn’t require any of this — but your custody order can assign what the statute leaves to speed, and courts routinely honor such allocations the way they honor 529 and tax-exemption clauses.
The both-already-filed cleanup
It happened anyway: two filings, one child, and the system’s duplicate flag. The sequence that ends fastest: (1) agree — or let the timestamps decide — which registration survives; between equal ranks the first valid election generally prevails, and fighting the timestamp burns more weeks than it wins. (2) The second filer stands down completely: no third registration to hurry things, no parallel support tickets muddying the record. (3) The surviving filer answers any verification requests promptly with the child’s SSA-matching documents, since conflicting child-detail spellings between the two filings are what escalate flags into manual review.
(4) Both parents implement the credential-sharing they skipped the first time. Throughout: the child loses nothing permanent — $1,000 eligibility rides on the child and waits out the mess; only weeks of compounding and some co-parenting goodwill get spent. The troubleshooting guide’s escalation ladder applies if a flagged pair stays frozen past 60 days.
Contributions, step-parents, and the long game
Funding is refreshingly rank-free: both parents, both extended families, and yes, step-parents may contribute — anyone can — sharing the child’s single $5,000 annual cap, which is the one place separated households genuinely must coordinate numbers. The clean pattern: the account-holding parent runs the ledger, the other household clears amounts before sending, and both keep copies of the basis log, because after-tax contributions become the child’s untaxed basis decades from now and redundancy across two households beats either one’s filing cabinet.
And the long game the paperwork serves: at conversion, the young adult inherits whatever relationship with this money the adults modeled. Two households that treated the account as the kid’s shared project — visible to both, funded by both, narrated at birthdays in both — hand over a steward. Two households that made it a front in the war hand over a symbol. The program’s rules can’t make that choice for you; they just make the cooperative version cheap. Take the cheap version.