I come from a very long line of good bakers/cooks and my DD and DS are both following on as are DGC. My Granny had the family bakery which was very popular. Everyone in the family had their own speciality and I think you have to find your own speciality and not expect to be the same as anyone else in your family. I am much better than my mother in everything except for her girdle scones and apple pies but DH says mine are every bit as good as hers were. 
DD taught her now SIL to cook while they were at uni and she is a very good cook. Her granny tells her to stand on her tiptoes to make her pastry after she has washed her hands in iced water!
DH loves cooking anything and everything and has inherited that from his mum, my DMIL, who was Cook in a very large House. I feel the need to use the capital letters as she was brilliant and I was in awe!
Her cakes for afternoon tea were legendary and exquisitely decorated with real flowers, picked from her garden, which she frosted with egg white and caster sugar.
To cook/bake successfully I think that you have to really enjoy what you are doing, have bags of confidence that it is going to be superb and most important of all feel well. If I am not well enough I know not to bother!