To "blend" as it were, make sure you have iron clad boundaries.
Encourage a good relationship with the ex partner if possible.
Stay out of fights involved DSC, mum or dad or as usual a weird combo of both.
DONT JOIN FINANCES. I know I know people will want to put my head on a spike for breaking mn rules of you aren't family unless you have joined finances but seriously money will become a issue.
Remove the option of it being a issue - pay into joint account re household bills and the rest of money stays with each partner to be spend accordingly. Maintenance also isn't a joint bill (I said what I said 🤷🏼♀️)
On the topic of maintenance- don't be drawn into a fight re maintenance if to high or low. Just don't go there.
If your struggling with DSC look for any redeeming qualities and latch on to them (like you would your own children when they are playing up)
Remember there's no rule book of what you should or shouldn't do in a blended family. Don't let people tell you there is because there will be another group of people telling you whatever your doing is wrong.
If you are a people pleaser- blending is not for you. I'm not fucking kidding.
Remember to like yourself because rarely will you be liked as a sm (both socially and sometimes by family)
Looking after the children occasionally is fine, do not repeatedly do this because you will become defacto childcare for mum and dad. School runs, ect are for the parents. If someone's died or it's a emergency sure.
Set up house rules created by everyone for everyone. And both people enforce them.
If he sounds like a Disney dad - run don't walk away.
No matter how lovely the man, if the ex is nuts (and witness it by your own eyes) again run don't walk. She won't get better and it's painful to watch when the kids are used and damaged by their parent.
Check everyone sleeps in their own bed and it won't be expected that when DSC are over they come in your bed and you sleep on sofa (ignore this if young obviously) but there was a thread about a 13 year old forced to sleep with her dad and partner forced to sleep on sofa.
Become Switzerland in terms of mum and dad. Hard I know but my god save yourself some agg and if they want to war let them war. Remember it's not your war.