Hi Margaret Wilkinson,
Suspect all of us have a little of our own way about these things.
Personally, I found it was pretty easy for my wanna-be relationships to grow and grow if I didn't come up with a way of sizing up my information and sources before I added the links.
I research at the family group level (great minds think alike--looks like you do too), so I often found myself in about the same place you seem to be. Ala, I had identified an ancestor's parent(s), but had yet to find enough information to place all the siblings. That part usually took me a while, sometimes a long while.
In my desktop software, I used these crazy tags called "Who's this?" to link between siblings and/or parents without creating a link. Over time, I found research notes to be just as effective.
On WikiTree, I've discovered free-space pages and believe these can be used to pull profiles and the notes together.
I'm suggesting you could keep the profiles separate and unlinked, and then web the individual profiles together with links to and from the free-space page. The free-space page could be home to your work in process research notes about the family unit.