Hi there I'm also a PGP. I haven't found that it has made a difference so far.
depending on how close you live to them you could make the offer of helping out with washing (sheets, towels etc. ie your son could drop it off to you and you could do it. He could collect it from you. That was something my DIL found very helpful as she had Csections both times.
If you say "I'm free today" that could imply that you're not free at other times.
It's very early days. You could say "anything you need just give us a shout". Congratulations by the way.
My dad spent 40 years mastering his craft, and last week someone half his age told him how to eat.😠

