Father is Virgo and mother is Leo. They are always quarrelling. Why is this?

These two constellations are very strong. If we don't give in to each other, quarreling is inevitable.

Leo's strength will be directly manifested, and he has the desire to dominate the outside world, but he often thinks too simply, not to control, but to take it for granted ... This is inherently contradictory. ...

Virgo is strong and stubborn, and it is difficult to give in to what you think is right. On the surface, she looks introverted, but in fact, she cares about many things and is easy to explode.

Therefore, one is bullying the weak, the other is opinionated, and there is no quarrel. ...

You can reconcile them and make them more tolerant of each other.