No, they're not. Kidney disease can be hereditary, however kidney infections are not. (In the same way that other "infections" are not hereditary - e.g nobody gets a hereditary cold).

yes you could get kidney infections by kissing pets it is proven by scientists

Kidney infections, like other bacterial infections, often result in a fever. The fever causes the symptom of headaches. These infections are treated with antibiotics.

Yes they get them, also urinary tract infections.

Kidney infections occur most often in adult females who are otherwise healthy. Urinary tract infections are uncommon in males until old age.