A MAN HAS 4 DAUGHTERS AND EACH DAUGHTER HAD A B RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Zero. If read to grammatical perfection, the riddle uses the word 'had' in a pas-tense format which means he no longer has children.

Therefore all of the daughters and brothers could be from a prior marriage, affair etc. Although, again, the riddle doesn't not specify that the brothers are 'step brothers.' Did you answer this riddle correctly?
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Mary has four daughters. Let x be the daughter.
Four daughters mean - x + x + x + x
Each of her daughters has one brother - let y be the son.
Total children => x + x + x + x + y. => 5
She has Total 5 children, all of her daughters have the same 1 brother. Did you answer this riddle correctly?
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I'm Batman! Did you answer this riddle correctly?
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3, 3, and 8. The only groups of 3 factors of 72 to have non-unique sums are 2 6 6 and 3 3 8 (with a sum of 14). The rest have unique sums:

2 + 2 + 18 = 22
2 + 3 + 12 = 18
2 + 4 + 9 = 15
3 + 4 + 6 = 13

The house number alone would have identified any of these groups. Since more information was required, we know the sum left the answer unknown. The presence of a single oldest child eliminates 2 6 6, leaving 3 3 8 as the only possible answer. Did you answer this riddle correctly?
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Break each of the pills in half, as you do this pop one half in your mouth and lay the other half aside for tomorrow. When he’s done this with all four pills he will have consumed one red pill and one blue pill. And have the same left over. Did you answer this riddle correctly?
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The man will break each of the 4 pills in half and eat 1 half from each of the pills. Did you answer this riddle correctly?
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He made $20. $10 the first time, $70 - $60 = $10, and $10 the second time, $90 - $80 = $10, for a total of $20. Did you answer this riddle correctly?
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I'll have a corona, hold the virus. Did you answer this riddle correctly?
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They ordered three cups, one for each person. The grandmother is also a mother and the mother is also a daughter.

Another solution: They ordered two cups. Both are mothers and daughters and one is a grandmother. Did you answer this riddle correctly?
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Four daughters and three sons. Each daughter has 3 sisters and 3 brothers, and each brother has 2 brothers and 4 sisters. Did you answer this riddle correctly?
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There are only 3 people
There's a grandmother her daughter and granddaughter. Did you answer this riddle correctly?
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"Is she older than her?"

Explanation: (He would ask one of the daughters if one of the other daughters is older than the last daughter). He always should pick the younger daughter based on what he knows. If he asks the older daughter and she says yes, then the youngest daughter will be known. If he asks the older daughter and she says no, then the youngest daughter is the other one. If he asks the youngest daughter and she says yes, she is lying and he will still pick the oldest. If he asks the youngest and she says no, he will just pick the other like in the first case. If he asks the middle daughter it doesn't matter because both will be acceptable choices. Did you answer this riddle correctly?
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Seven (DAD + MOM + FOUR DAUGHTERS + 1 SON) Did you answer this riddle correctly?
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There are nine Mustards in the family. Since each daughter shares the same brother, there are six girls, one boy and Mr. and Mrs. Mustard. Did you answer this riddle correctly?
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Mary. Did you answer this riddle correctly?
YES  NO