At least significantly no in many cases (not necessarily all).
1. The Bible makes clear that 'the sins of the fathers can be visited upon the children to the 3rd and 4th generation.'
2. There is abundant evidence that all manner of influences can occur to the child in the womb. Mother's food, attitudes, moods, stress, anxieties etc. all can influence the child in the womb.
3. It is extremely plausible that spiritual influences--particularly deliberate demonized/satanic ones CAN influence the child in destructive ways. There are plenty of anecdotal cases affirming exactly that, BTW.
4. Certainly environmental influences after birth have a huge impact, ALSO.
From:
https://en.wikipedia.org/wiki/Epigenetics
"Epigenetics is the study of heritable changes in gene function that do not involve changes in the DNA sequence.[1] The Greek prefix epi- (ἐπι- "over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional genetic basis for inheritance.[2] Epigenetics most often denotes changes in a chromosome that affect gene activity and expression, but can also be used to describe any heritable phenotypic change that does not derive from a modification of the genome, such as prions. Such effects on cellular and physiological phenotypic traits may result from external or environmental factors, or be part of normal developmental program. The standard definition of epigenetics requires these alterations to be heritable,[3][4] either in the progeny of cells or of organisms."
Its probably Scientific for me to say that I am overweight because my mother did not eat much in the depression. (And not, of course, her fault.)