Similar - my grandfather is my only grand parent with high cholesterol, he's now 93 and has out lived all my other grand parents and his sister. It's clear to me that there's a lot here that we still don't understand.
In my family all the cooking/frying is done with clarified butter. Butter, cheese, definitely no margarine/crisco, plant oil only for salads. So far no cardiovascular problems.
The interesting side effect to me here is using butter one might keep the cooking temperatures a little bit lower. Butter burns at a lower temp than many plant oils.
Not clarified butter; it's clarified so that it can be cooked at higher temps (it also keeps longer). Clarified butter has a higher smoke point than several plant oils.