Counting objects
How do I say the following:
I have two children
I have two sons
I have three cars
I havs three houses

Question

Answer

I have two children 
我有兩个孩子
[Pinyin] wō yǒu liǎng gē hái zi

I have two sons 
我有兩个兒子
[Pinyin] wō yǒu liǎng gē ér zi

I have three cars 
我有三辆車
[Pinyin] wō yǒu sān liàng chē

I have three houses 
我有三栋房子
[Pinyin] wō yǒu sān dòng fáng zi

Answer

for sons, use 个
for vehicles use 辆/架
for house, 栋/间, 座 for mansions and large buildings.

Answer

我有兩個小孩
我有兩個兒子
我有三輛車
我有三棟房子

Answer

Hi, I'm a Chinese native speaker in Taiwan.
 I can answer the most common counting objects we usually use to your questions.

I have two children  我有"兩個"孩子
I have two sons  我有"兩個"兒子
I have three cars 我有"三台"車 or 我有"三輛"車
I have three houses 我有"三棟" 房子

Hope these help~ :)

Answer

我有两个孩子
我有连个儿子
我有两辆汽车
我有三座房子