Toriel

Toriel is a secondary character in Rosefell who has made minor appearances here and there. She was also originally the queen of the Underground before she got a divorce with Asgore.

Asgore
Asgore is Toriel's ex-husband and they haven't seen each other in 29 years. Toriel has absolutely despised him ever since he began killing human children for their souls.

Asriel
Asriel is the son of Toriel and he was very close to Toriel before he died. He hasn't spoken to her after he became Flowey.