I love this answer from Anne Lamott:
Q. I wish you’d say something about how children can thrive in all kinds of environments, not just the typical, traditional “happily married couple” kind we put on a pedestal. What is a successful family?
A. That “ideal” is very rare. Most marriages are a mess, and the children get caught between two bitter, antagonistic parents. My parents stayed married for 27 unhappy years, till their kids were grown, and this was a catastrophe for us. I had to be my father’s wife, my mother’s mother — my brothers had to be her husband. We all had way too much responsibility, trying to keep the family afloat. I felt like I had a caseload by the time I was 6 or so. All I needed was a clipboard. All three of us kids could make blender drinks by the time we were 8 years old. My parents’ bad marriage pretzelized us, and stole our true selves away from us — luckily we all ended up drinking and using (we all have 20+ years clean and sober now). This is the far more common outcome of marriage.