家族歌 jiā zú gē / Family Song
The subtitles of this song are simplified characters. So for your reference, 妈妈=媽媽 and 爷爷=爺爺. As for the rest of the characters in this song, there is no difference between the simplified and traditional versions.
In the song, you will also encounter 姐妹(jiě mèi) which means sisters, and 兄弟(xiōng dì) which means brothers. Remember them before you start to sing the song.