Number + 个 + 儿子
The noun 儿子 (érzi) means "son" and is used to refer to a male child in relation to their parents. It is a common kinship term in Chinese and can be combined with numbers and measure words to indicate how many sons someone has. For instance, 两个儿子 means "two sons."
她的儿子今年刚上小学。
Tā de érzi jīnnián gāng shàng xiǎoxué.
Her son just started elementary school this year.
我儿子特别喜欢画画,每天都在练习。
Wǒ érzi tèbié xǐhuan huàhuà, měitiān dōu zài liànxí.
My son really loves drawing and practices every day.
他们的儿子在国外读大学。
tāmen de érzi zài guówài dú dàxué.
Their son is studying at a university abroad.