There are three one-child families. Their children are Xiao Jun (male), Xiao Yong (male) and Xiao Lan (female). The children's fathers are Lao Wang, Lao Zhang and Lao Chen; The mothers are A Rong, A Ling and A Fang. For these three families, it is known that (1) the children of Lao Wang's family and A Ling's family have participated in the young men's martial arts class; (2) Lao Zhang's son is not Xiao Yong; (3) Lao Chen and A Fang are not a family.
According to the above conditions, it can be determined that
Lao Wang, A Fang and Xiao Yong are a family