Big, Scary, but Chill
They say you should never judge a book by its cover. The OP, who babysat eight kids (!) for one family, met the dad, who was big, had a deep voice, and could probably crush their skull if he wanted to. He was also one of the chillest dudes on the planet, according to the OP.
He turned a blind eye to the fact that the babysitter was bringing over her boyfriend, presumably not to help with the babysitting. The husband was also an avid user of the “plant” that we’ve talked about so many times, which was what probably gave him such chill vibes.