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Hey woofgang, thank you for your reply.
His kids may call him on Friday morning, but I'm guessing not as we will be picking them up in the evening and I dont suppose the kids, being kids will realise how it is for him.
If they could come over in the morning, then it would be good, but he does not have the best relationship with there mum so probably wouldnt want to ask, and I am certainly in no position to be contacting them about it!
Just hope he doesnt mind spending the day with me as he has it off work!