No, but it is a big factor and it matters. That’s all. And of all other kind of memory traits be it will, stability of mind, purity of body-mind, strength of character all this can be made/learned but the genetic memory is not that malleable and that is another reason that the good one’s passes on.
I doubt ( can be wrong here ) that I inherited blood line from some extreme spiritual family, certainly not from my parents but still I am as spiritual as one can be and I am Quite good at what I practice. SO, Genetics- family lineage is one factor out of many.
Yes, it should not be the sole factor. I wasn’t parented well, to put it mildly so NOT going to be a parent. Even if I shift to Mantak Chia’s version of Sexual life and have sex like crazy rabbit for decades , still not going to Bring another innocent life into this cruel world. I know very well How cruel it can be even for Children. And if it is someone you are extremely attached to it is GONNA HURT REALLY BAD.
As for to please dead people, well have already done enough for them , more than they ever did for me. Any offering You do to ancestors is actually an offering to 1- where ever that ancestor is, and will get benefit from it and 2- The genetic material in your body linked to that ancestor, so many genetic friction will get smoothed by that offering and in practical terms , a lot of problem will go away from your life.
So , technically you are offering your ancestors for your own good. And in my opinion it is doing more than enough for them.
AT the end of the day do what ever you feel like it. It’s your decision and only you will know that if it is worth it. Just keep in mind that having a child is a 20 year old project. Give some serious thought before starting it.!