Other options might be breeding dahlias, training police dogs, running a small business in which you have a partner and employees, or making a career as a wet-nurse
That's why I say that most modern adults are polyamourous by mid-life, even if not fully sexualized. For instance, returning to my sitcom example, in Seinfeld, Jerry is obviously the "parent" of his group of friends, because they are most frequently clustered near his kitchen. In exchange for providing higher proportion of resources, he is able to exert higher level of control over operations (or vice-versa.) His front door which he locks and unlocks as he admits his friends into his domicile represents the masculine energy inherent in parenting (territorial imperative, exhibiting care through exclusion)and the food in his kitchen represents the feminine energy inherent in parenting (placenta, breasts, hearth, exhibiting care through inclusion.)
So, in a situation involving open contract between adults, who are at a level of maturity and experience to recognize sexual infatuation or romantic limerence for what it is, problems with "sharing" are not very difficult to resolve, because Elaine does not own Jerry or the crackers on Jerry's counter any more than George owns Jerry or the crackers on Jerry's counter, and they both possess either ownership or access to other realms in which they may fill any variety of leader, partner, peer, or follower role.
OTOH, since my father was my primary parent, and I had 3 sisters, I am chuckling at the notion of Jean dealing with 8 teenage daughters all trying to get ready to go out on Friday night given his current bathroom accommodations. In some polygynous cultures with relatively easy divorce provisions in which men are routinely granted custody and females are granted adult status at age 13, the girls often choose to go live with their mothers at that age. In those cultures, men also can't financially divorce a woman and take custody until child is weaned. So, that is something Jean might want to take into account given that reductionist/reconstructionist nutritional science has not yet devised true replacement for complexity of breast-milk or the associated experience towards human development.