Had the same bug as PhilPhil described below, after finishing the grandma level. I love the unique touches you gave each family member, and I almost fell off my chair when the dad was just saying 'ow ow' as he was walking on the spikes. With the dad, there was a lot of trial and error involved where he got stuck and I gave up trying to manage it all, though I think the game works well if you use a systematic approach and don't try to bring home everyone all at once.
I love what you did with Kenney's assets. I hadn't seen these before and you really made them shine. Like making the baby a much smaller scale version of one of the characters, and the dad stretched (though that was a bit too obvious). Using emojis with emotions for the mom's texts was a nice touch as well.
One annoyance I had was with the first key. It's a pain to need to pick it up every time, and I don't think it added real value to the gameplay. The second key was nice because it's more of a puzzle teaching you how to use the dad, but having to do it every restart is pretty cumbersome. I also think there's no real value to the grandma starting at a height.
Good level design and good polish on the delivery of everything! This was definitely fun :) good job!