1. The spouses and children of the deceased brothers and sisters have an interest as well. the cottage is not just owned by the three surviving children. Essentially, upon your mother's death, all surviving 5 children would have had an equal share. As each of the two children died, their share would have devolved in accordance with their will or by the rules of intestacy to their spouse, children or surviving relatives. So it is not correct to say that the three surviving children own the cottage together.