I've had unexplained worsening pain/aches in legs since a child.more so at rest.my father has same issue. never knew cause.is there hereditary causes?

Sure, & some people : Never know they have them, unless they develop progressive weakness, fatigue or other symptoms. There are charcot-marie-tooth disorders that affect peripheral nerves & other disorders that impact the muscle's ability to sustain function or utilize energy. It's certainly worth asking your doctor for referral to a geneticist at a major medical center near you.