Riddle: This woman was born in 1975

The little girl is sitting at the table and innocently playing with the spoon while looking at her mother.
“Mom, while you were at work, a strange lady came into the house. »

The mother, who is busy putting away the shopping, stops suddenly.
“A strange lady? We’ll see when Dad comes home. »

The tone is dry, but the little girl shrugs her shoulders without being impressed.

A few hours later dad arrives. He had scarcely put down his briefcase when his mother stared at him with her arms crossed, as if she was ready to fight.

“So, tell dad what you told me before,” she asks the little girl.