After my husband’s passing, we owned a flat jointly. The agreement was in both our names. I later transferred the ownership to myself. Could my in-laws challenge this or claim a share in the property?

Yes, your in-laws could challenge the transfer. Joint ownership implies a right of survivorship, meaning the deceased’s share automatically passes to the surviving joint owner. Transferring ownership to yourself without their consent might be deemed invalid, and they could claim their rightful share through legal proceedings.