Should I help put them to bed at his house?

ldoo

We just started overnights 3X a week last week at their dad's for my 2yo and almost 4yo. I know the older girl tells him at bed time that she wants me, wants to come home, etc. She cries. It obviously upsets her, although I don't think it's a massive problem.

He suggested maybe I should have dinner tonight with all of them and be there to help put them to bed. Help ease the transition. 

I will do ANYTHING to help with this rough time in their lives. But is this a good idea? I know it will help ease their minds, but long-term, I can't put them to bed at his house. Plus, I worry that they'll just want me to take them back to my house and not even be at his. And obviously that won't happen.

What should I do? Just let him do it without me and hope it gets easier for my girls? (I should add that she's always in a better mood when she's napped. She did not nap yesterday, which might have contributed to her being upset. She DID nap today.)