Children were sitting on their parents' lap or laps?

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Chapters
00:00 Children Were Sitting On Their Parents' Lap Or Laps?
00:14 Accepted Answer Score 10
00:29 Thank you

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ACCEPTED ANSWER

Score 10

There are multiple parents, each with their own lap.

Therefore, the children (collectively) were sitting on their parents' laps.

However, each child was sitting on one parent's lap.