Searchers still type custody, and your pleadings do not
The words in your filings and the words in the search box drifted apart years ago, and your pages have to carry both.
Illinois practice generally talks about parenting time and the allocation of parental responsibilities. The parent in Ravenswood typing at eleven at night is not using that language. They type custody, sole custody, or how do I get full custody of my son.
Write only in statutory vocabulary and the page never matches the query. Write only in search vocabulary and you look like a content mill to the reader who has already spoken to two attorneys.
Do both. Use the searcher's phrasing in the heading and the opening line, then explain what the court and your pleadings actually call it. You get the match, and you get the credibility that closes the gap between reading and calling.
Keep a running list of the words clients use next to the words you use. Visitation, legal separation, full custody, alimony. Check every new page against that list before it goes live.