If My daughter and grandchildren live with me and daughter doesnt work and I claim them as dependents. Will it effect her chance of a stimulus check?

You can claim them if you provide more than half of their support and your daughter doesn’t have more than $4,300 in taxable income.  If she is your dependent she will not get any stimulus if there is any in the future. 

Yes, it will affect her chance of a stimulus check.  If you claim your daughter on your tax return as a dependent then she will not receive the third stimulus check and she will not receive