Once my village has reached its maximum population (90 or more) I don't find any difficulty in creating master parents, especially women. Once a (female) villager reaches master in her first skill, she is usually over 18 and I'll switch her to parenting. I'll drop her on a boy a few times until she becomes a trainee parent. The pop-up maximum population warning is a nuisance, but can be suffered. She'll then run around on her own looking to kiss some poor guy and drag him to the loveshack. With plenty of rests for enjoying the pond and cooling her feet, naturally. After a day or so she will have become a master, and I can switch her to her third skill so she can become an Elder. The men aren't so lucky. I'll normally only create one or two male parents at a time, or nobody would get any work done.