Absolutely not benefit bashing at all. I have been there myself. Thank goodness for benefits.
I am bashing those with the double standards because IMP both parents have chosen not to work because it makes financial sense to them to do so. The difference being that ex cannot claim any benefits so his income is completely 0. He cannot contribute what he doesn’t have. So saying the money he is living off isn’t going on his children is wrong he doesn’t have any, he’s living off his wife’s wages which is paying for a home for her and her children the same way and OPs money is doing. Neither mum is in a different situation to the other. NRP is providing the childcare for his twins, and RP is providing the childcare for the other 2, this is because as rightly said, childcare is expensive.
But actually as a single parent a percentage is paid so UC will cover most of it. On UC it definitely pays more to work part time and top up than completely not work. On the old system then no it didn’t always; but UC yes definitely.
The other option is NRP has the children 25% of the time, no reason he cannot have them every weekend, no school, OP can work then at the weekend without worrying about any childcare costs or logistics.
Again, my actual opinion is just it’s something to have to live with and while not ideal, legal and it is what it is. But there are other ways to improve the situation other than asking SM to pay. Who doesn’t have any legal responsibility at all to do so.
We are also missing that his new wife will already be funding the children the 25% of the time they are there as he still has 0 income and can’t claim anything due to wife working likely, so she is already picking that up. I think to expect anything beyond that from her is unreasonable.
He should be paying towards the travel costs though 50/50 at least or doing one journey there or back.