Is it acceptable for a mother-in-law and her grandson to wear paternity clothes?

It is acceptable for a mother-in-law and her grandchildren to wear parent-child outfits. Nowadays, many grandchildren are brought up by mothers-in-law. Some mothers-in-law love to dance, especially square dance, and it's cute to wear a parent-child outfit and bring your little grandchildren along for square dance. The child can follow the mother-in-law to see more of the world outside. It is also a kind of exercise for the child.