Is it normal to kiss your mom on the lips?
Depends.It depends
Yes, some families kiss on the lips as a normal sign of affection, while others find it unusual. What matters is that you and your mom are both comfortable with it.
Families have different habits around affection. For some, a quick kiss on the lips is as ordinary as a hug; for others, kisses are for cheeks or foreheads. Culture and family traditions can shape what feels natural, too.
There’s no single correct way to show affection. If either of you feels uncomfortable, it’s fine to switch to a hug, cheek kiss, or another greeting that feels right to both of you.