What does "国民岳父" mean?

韩寒 韩寒频晒女儿小野萌照并分享其天真有趣的生活点滴，大批网友纷纷包围韩寒微博留言齐喊 “岳父大人”，故称国民岳父

ENHan Han. Han Han frequently posts cute photos of his daughter Xiaoye and shares her innocent and interesting life moments. A large number of netizens have flocked to Han Han's Weibo to leave comments, all shouting 'Father-in-law,' hence the name 'National Father-in-law'.