I live in the USA, My wife and I have 4 natural-born children (13, 13, 9, 7 years old). We also are foster parents, and recently took in 2 more young children (2yrs and 6mo old baby) while their mom works out her issues. We also have a relationship with a former foster child, and take in a 7th child (2 years old) like a nephew every month or so for a weekend to give his single dad a break.
I've been reluctant to discuss this arrangement with my work colleagues, as I feel management may look down on me for future career advancement/promotion/bonus/etc. When we meet new people (outside of work), and they find out the size of the family, we'll usually always get comments like "You sure have your hands full", or "You must not have much free time". I don't want these types of thoughts spilling over into my manager's mind when he makes people recommendations to upper management.
Would you, as a manager, think slightly less of an employee having a large family, even if they got their work done and did a great job?