AIBU about holiday?

[aconfud]

My partner and I have just separated, he had left the family home. There are currently no formal child care plans in place, and the majority of our relationship I’ve done 99% of the child rearing. He has often been unreliable. However, he wants to take them abroad with his family in 3 months time.
I don’t feel comfortable with this - for a number of reasons - however he has parental responsibility so I’m unsure I can stop him.

How old are the children & how long is the holiday?

And to where?

Fight for custody

The children are 5 & 2, holiday to Spain for a week.

Are you concerned he won't return them? Won't come back to this country?

Are you concerned they'll not cope without you?

Are you pissed off he can afford to do this, is willing to do this but day to day does bugger all?

Are you resenting him being the fun time only parent?

While yes I am slightly pissed off that ‘flexible’ agreement with the kids (he seems them as an when suits him), I am concerned about the girls being in a different country.
More often than not visits to his family have resulted in huge arguments, especially with him being heavily involved - we even got kicked out of the house on a visit once as a result.

It's shitty and unfair but are they safe with him? Emotionally and physically.

Physically yes, emotionally no.