彼の年収は、私達家族全員の合計より高いって英語でなんて言うの？

Someone is said" to make money."..so when we want to discuss a very well paid person's income or salary earnings, we might say something like this:
"He makes more in a year....than my whole family combined!"

Explanation: Another way of saying 'income' is 'earnings' so you may vary your vocabulary a little.
Example sentence:
"Average earnings have fallen by 0.5% in the last quarter."

His annual income is very high. Higher than what my entire family makes in a year.
He makes a lot of money. Much more than my whole family in a year.
My family makes $100,000 a year. Mr. Blank makes twice as much as that.
If I added up what each person in my family makes in a year it still wouldn't come close to what he makes.
He makes more money than my whole family together makes in a year.
His yearly salary is higher than what my whole family makes.

IF you are talking about things joined then you would say 'combined' or 'put together' when talking about all your family you could say 'all my family members' or 'my whole family'
The money you get from doing your job is called your 'earnings' or 'income'

You can use make and earn interchangeably when talking about money. For example: 'Make money' and 'Earn money', both have the same meaning.

"Put together" is a phrasal verb that has the same meaning as the word 'combined'. For example:

"She is more intelligent than all of us put together!"
"He is a better cook than all the chefs in the world put together!"
"She is the cutest dog in the world, cuter than all dogs put together"

"His yearly salary is more than my family's combined!" 'Salary' is the term given to someones income, weekly, monthly or yearly salary.
To 'Combine' something is to be joined or put together ex. "Pancakes are a combination of eggs,flour, Milk and butter.
"Hey makes more in a year than my whole family does put together!"
When using 'Put together' this can be used to describe something that has been joined or combined.

The sentences above can be used to express that a specific man, on his own, makes more money than a whole family put together.

Yearly: pertaining to a year
Income: salary, income
Collectively: put together, all together

Some people earn quite a big income, it all depends on the work they do and the qualifications they hold.