DP and I have a joint account and seperate accounts, our wages go into seperate accounts then we both transfer a set amount into the joint account, I earn more so pay a bit more in then DP does, we are both left with the same amount of money in our seperate accounts although occasionally I will be left with more depending on if I've done any over time.
All household expenses come out of the joint account and anything left in it after bills are paid is used by either of us for anything needed, including for DSC.
DP pays maintenance, his mobile bill, DSC's pocket money and car insurance from his own account.
I pay my mobile bill, car insuraance and everything for the horses, dog and rabbits from my account.
Anything the DSC need comes from any of the accounts depending on who they are with at the time ie, I took DSD to get her eyes tested so I paid for her glasses, DP took DSS to have his hair cut so he paid and they both needed new school uniform which came from the joint account.
I know some people think its strange to have seperate finances but its how we like it.
We are a family and it doesn't matter if 2 members only live here part time if they need something then as the adults in the family we provide it.
I don't have children of my own yet but when I do I will consider us a family of 5..... 2 adults and 3 children