Joe Ma (馬德鐘) has a son named Ma Xiang (馬在驤) who is currently 22 year old and the reporters discovered he is dating his classmate aka swimmer, Marissa. Both held hands and took photo together. Joe confessed to the media that Ma Xiang and Marissa were in a relationship and seldom interfered in his life.

Source: https://ol.mingpao.com/ldy/showbiz/latest/20200725/1595660734754/%e5%85%92%e5%ad%90%e9%a6%ac%e5%9c%a8%e9%a9%a4%e6%88%80%e4%b8%8a%e6%b8%b8%e6%b3%b3%e5%a5%b3%e5%b0%87-%e9%a6%ac%e5%be%b7%e9%90%98-%e6%ad%a3%e5%b8%b8%e4%ba%a4%e5%be%80