his wife and other females
His wife and other women. The word "female" is an adjective and should not be used as a noun unless referring to e.g. animals. Like myself, you are (probably) non-native speaker of English so I don't weigh this all too heavy, but others might since it is considered somewhat disrespectful to women.
Kids of that age would more-or-less walk while sitting on these. The pedaling comes after balance training (unlike how my generation used tricycles at the same age).