Yes. All those things combined. It was/is a very parallel poly, and my wife had issues with overnights. At a certain point a person would like to have more, and I would like to give more, but the situation was not viable enough to do so.
Ah, okay. So now things are changing, and it's possible you'll be able to host in the not-too-distant future, the issues with the older relatives and the elder kid, and whatnot, having evolved.
What you say about wanting more reminds me of the
relationship escalator in poly. I haven't written it out in a while, so here goes.
In monogamy, ideally, you and your dating partner are headed towards some kind of permanent thing, just the two of you. Either living together, or actually getting married. But there are many stages to a relationship, and in poly, there is often no need or desire to ride the escalator to the top.
Starting from the bottom of the escalator (but not necessarily entirely in this order, and sometimes skipping a floor altogether), the two members of a typical relationship today can get off at any floor:
Swiping on a dating site
Chatting on the site
Exchanging numbers and chatting more
Maybe exchanging more pix (even naughty ones)
Phone calls, video calls
First date
Subsequent dates
Making out
Sex
Overnights
Weekends together
Calling each other bf/gf/partner, or another term indicating this is "real"
Meeting each other's friends
Meeting each other's families
Taking vacations together
Moving in together at one of your places
Getting a pet together
Mingling finances to a degree
Making a major purchase, furniture, a car
Actually buying/renting an apartment/house/condo together, sharing a lease or mortgage
Having kids
Getting married
Lifelong commitment (or divorce, as the case may be)
Growing older together
Retiring together
Going on a world tour (haha)
Golden years
So. You have a wife and kids, a home of some sort. You've traveled somewhere up the escalator with the wife and plan to stay on it.
But meanwhile, you want one or more long-term relationships with other women. Perhaps you need to determine what that means for you regarding the escalator, what you can offer. And then you also need to consult your future poly dating partners about where they'd like to be on the escalator with you, and with any other partners they may have now, or in the future. And you need some consent from wife for you getting off at one or another of these floors with future partner(s).
The more you have your life together, the more you and wife are on the same page, the more attractive you will seem as a dependable poly partner who seems like a good bet for a long-term future with someone new.