We have 50:50 arrange with DH’s EW, it’s pretty standard offering these days in the courts.
There is a couple of ways you can do it. Week on week off or split the week. We split the week and it works well as every week you have the same days and therefore you can arrange appropriate childcare for that child within your time for after school and holidays etc and those days don’t change every week (good luck getting childcare Monday - Friday every other week) although if at all possible try and share the same childcare provider, they will sign you both up individually and contract you for your days/times required.
Monday & Tuesday nights - Parent 1
Wednesday & Thursday nights - Parent 2
Friday, Saturday & Sunday nights - Alternate
Handover time for holidays is 3pm (school finish) and the parent who would be dropping the child to school is responsible for childcare until that time (i.e. paying a childminder etc in the holidays) you can adjust this time to suit but this is very important (saves arguments - trust us
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School uniforms - we have identical set ups in P1 & P2 house (same trousers/shirts etc so they are interchangeable) and we buy our own jumpers. DH buys a floater jumper so there is no arguments that one jumper is getting more wear.
Parent 1 - responsible for school bag/lunchbox/pencilcase etc
Parent 2 - responsible for shoes and coat
(this costs more than the other option as will often require several options and replacement every year minimum. DH picks up this tab as he is the higher earner)
School trips - pay half each
Clothing - full wardrobe at each house and each parent returns the child in what the child arrives in....... this never completely works out so I would suggest having decent cheap clothes on hand for school dress down days etc we lose everything that enters the opposite home. Try not to stress over this. It’s not worth it.
Christmas - 10am Christmas Eve until 10am Boxing Day alternate years and any nights missed are always caught up and the parent that doesn’t have the child for Christmas does for NYE&NYD.
Birthdays we never set an arrangement as by the time DH & EW split DSS was almost at school so it’s mostly irrelevant what day.... you get lucky for years in a row and then unlucky for years in a row.
The parent who has the child on their birthday would pay for the birthday party opposite parent invited (we’re mostly civil)
That’s pretty much it. Do make sure your friend sorts out the finer details though as it really does make a huge difference. DH hadn’t and we spent the first few years arguing constantly so sort of did DIY mediation and agreed the finer details. We do have a huge amount of flexibility on all we do and you have to remember the child is in the middle of every shitty decision that is made (at eachother)
Wish your friend the best of luck 