Board Thread:Questions and Answers/@comment-5808186-20170801093304/@comment-33470269-20171018194548

The ruins were abandoned because it was really small, so some people moved to snowdin, others just moved to waterfall, and others to hotland...

About this question, before it was Asgore, Asriel, Chara and Toriel ( maybe ) and now it's just Asgore ( maybe x2 ) since Toriel left him.