If there be no survivor, the homestead descends to the issue of either spouse according to the rules of descent, unless otherwise directed by will. [C51, §1264; R60, §2296; C73, §2008; C97, §2985; C24, 27, 31, 35, 39, § 10152; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §561.18 ]