OP, I used to be a carny, we mostly did inflatable rides, mechanical bulls, etc. Any ways one thing I learned doing this is how easy it was for people to get hurt on slides when riding with other people. It was a strict rule at my company, and with our insurance that there would be no dual riding.
The reason for the strict rules was that every year there were multiple
fatalities (yes, deaths) from dual riding on slides throughout the country. It was almost always a parent riding with a small kid. One of two things typically happened, either when they got to the end of the slide, the kid was crushed by their parent. Or the kid would put their feet down on the slide, get pulled off their parents lap and the parent would go right over the top of them. On top of the couple of deaths a year, there were hundreds of major injuries.
I used to have parents yell at me all the time about this, but it has very good justification. Actually, just yesterday I saw my SIL go down a 4ft slide in the park with her 10mo baby, the baby put her foot on the slide, and it got sucked under SIL's leg, luckily it was a very short slide or else she probably would've ended up with a broken leg.
No. Even the family rafts don't allow lap sitting. Or at least didn't. It's been a while since we went to the water parks.
This is still true. My 11 mo infant rode Teamboat Springs with me at Blizzard Beach, and she had to sit in a normal spot by herself. I am still shocked they let her ride it at all (she did have on a real infant lifevest that we brought with us). She did really enjoy it.