Однако родители 3 детей шутят, что

Однако родители 3 детей шутят, что появления третьего ребёнка просто не заметили - по сравнению с первыми двумя это не такой уж и стресс для семьи.

Результаты (английский) 1:

However, the parents of 3 children joke that the emergence of a third child just not noticed-as compared with the first two is not so stressful for families.

Результаты (английский) 2:

However, parents of 3 children joke that the appearance of the third child did not notice - compared with the first two is not so stressful for the family.

Результаты (английский) 3:

but the parents of three children joked that the third child was noticed compared with the first two, it's not so stressful for the family.