Is it normal to kiss your grandma on the lips?
Depends.It depends
It’s normal in some families to greet or say goodbye with a kiss on the lips, while others stick to cheek kisses or hugs. What matters is that you and your grandma are both comfortable with it.
Families have all kinds of affection rituals, and a quick, nonsexual kiss on the lips can simply be one of them. In other families, it would feel unusual—there’s no single rule everyone follows.
Pay attention to how you both feel, and don’t feel obliged to keep doing it if either of you would rather switch to a cheek kiss, hug, or another greeting. A kind boundary is completely okay.