Board Thread:General Discussion/@comment-25266931-20161228230634/@comment-25936766-20170107235910

More or less the last bit. I feel Taiyang figures that if Ruby knew about the eyes, she would be even more determinated to follow Summer's example....and we know how well things ended up for Summer.

He already nearly lost both of his daughters once, he likely doesn't want to risk encouraging them into doing something that would make that more likely to happen again. Some bits of dialogue about him here and there do make Taiyang sound overprotective.