on one’s knees; in one’s lap
Вес тела должен быть на коленях.
The body weight should be on the knees.
— Следствие по делу гражданина вне всяких подозрений (1970)
The cat is snoring on my lap.
They were on their knees.
Кошка храпит у меня на коленях.
The cat is snoring on my lap.
Том сидел на коленях у мамы.
Tom was sitting on his mom's lap.