How should separated parents actually handle things for the children?
By treating the parental relationship as a continuing working arrangement rather than an ended personal one — because the evidence is consistent that what harms children is not separation itself but sustained conflict between parents, before, during and after.
What the research actually finds:
Children of separated parents do less well on average than children in low-conflict intact families, and as well or better than children in high-conflict intact families. Conflict is the variable, not household structure.
The harm comes from specific things: being used to carry messages, hearing one parent criticised by the other, being asked to choose or report, loyalty binds, and conflict at handovers.
A warm relationship with at least one parent is strongly protective.
Stability and predictability matter more than the precise division of time.
What actually helps:
Never pass messages through the child, in either direction. This is the most damaging common practice.
Do not criticise the other parent in front of them, including sighing, eye-rolling and tone. Children experience criticism of a parent as criticism of half of themselves.
Keep handovers brief and neutral, in a public place if needed. Handovers are where conflict concentrates.
Communicate practically and in writing where relationships are difficult — parallel parenting, with minimal contact and clear written arrangements, is a legitimate approach where cooperative co-parenting is not achievable, and works.
Agree the basics — bedtimes, screens, homework — even loosely, so the child is not managing two contradictory regimes.
Tell them the truth simply, that it is not their fault, that both parents love them, and that they will not have to choose.
Keep them out of the legal process.
What the legal framework says. Courts start from the presumption that involvement of both parents furthers a child's welfare unless the contrary is shown, and the child's welfare is the paramount consideration. There is no automatic 50/50 entitlement, and arrangements are expected to be agreed between parents where possible, with mediation usually required before court.
Get support for yourself, since your regulation is what the child experiences.
General information, not legal advice.