I've seen so much information today, but I don't recall seeing that TMH alone was supposed to meet DY to exchange Kyron. IIRC, KH stated that he came home early to work from home for a bit and then they had plans to go out for an ice cream treat after Kyron got off the bus. Do we know for fact that KH was not taking Kyron to drop his to DY? For that matter, I also don't recall hearing either KH or DY state that Kyron was supposed to be going to DY's for the weekend. Have they actually cleared that up yet?
If Kyron was indeed supposed to go to DY's for the weekend, what seems strange to me is not who was taking him, but that KH, TMH & Kyron would go for ice cream after he got off the bus at 3:30, instead of getting on the road to take Kyron to meet DY at least 2 hours away that would not put him to DY's house until 8 or 9pm.
Does it make more sense for TMH to stay home with Baby K? Possibly, but there have been a couple of times where both DH and I have taken our younger children to return my step-daughter to her mother's for no other reason than we enjoy the drive and spending time with each other.
My understanding was that Kyron was to go to DY to go on a fishing trip for the weekend with Tony, because Tony had bought him a fishing pole for Xmas. Further, TH was supposed to drive him to meet DY. I asked the question also--when was KH supposed to take him for ice cream?