2016 Olympic silver medalist Tan posted a picture of him and his pregnant wife Chia Shi Leng on Sunday with a caption that read ‘2020 Surprise!’.
The doubles ace and his wife, who also have a son, are expected to welcome their new addition in October.
For Lee, it was the joy of receiving a drawing resembling himself from his sons, Kingston and Terrance.
“Got a little surprise from my two sons. Very touched for their effort and it made me feel my importance in their lives. Being a dad is not easy, sometimes we yearn to be funny and casual yet need to put on the stern face in front of them.
“We would do anything just to make them proud. To all the dads in the world, give yourself a pat in the back. Your children may often choose ‘mummy’ as their preferred parent. It’s okay, a good thing. As one day, when you leave this world, you will want your wife to be cared for by your children.
“Continue to be the invisible hero, all fathers,” he said.
The former world number one has had plenty of time to spend with his kids since his retirement last June, and regularly takes to social media to share his moments with them.