Descendant
noun
A child who is the grandchild of someone else is a descendant of that person.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
彼は宮家の子孫です。
He is a descendant of the imperial family.
子孫たちが、私の意図に気づく日は来るのだろうか？
I wonder if the day will come when my descendants realize my intentions.
あのフィギュアスケート選手、織田信長の子孫なんだって！
I heard that figure skater is a descendant of Oda Nobunaga!
歴史的な人物の子孫たちが、今どこで何をしているのか知りたいと思いませんか？
Don't you want to know where the descendants of historical figures are and what they are doing now?