Why don't you increase the number of your family members. Things often get smooth when a family gets bigger.
Are these sentences correct and make sense?
sundarnaz make sense? No. You should explain what exactly you mean.
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sundarnazmake sense?
No. You should explain what exactly you mean.
Why don't you have [another child / more children]? Things often get better when a family gets bigger.
I don't agree with the thought expressed by the second sentence, but the grammar is fine.
CJ