Who divides up balance of booking deposit amongst vendors after sale

[Dr Strangelove]

I don't have any communication with my siblings

I'm not sure how you could have engaged an estate agent jointly despite zero communication.......but your problem seems solved by now.

 

[MisseyB]

Then I think he will have to pay out to all three. Make sure he doesn't issue a single cheque with all 3 names!

Good point. He did say he'd pay us each separately.