The mutation that would be passed on to living offspring if it happened in a parent is:
an insertion mutation in a gamete that deactivates a gene for hair color.
This is because mutations occurring in gametes (sperm or egg cells) can be transmitted to offspring, while mutations in somatic cells (like those causing skin cancer) are not inherited. Silent mutations also do not affect phenotype and would not necessarily be passed on in a way that affects the offspring. The chromosomal deletion affecting blood function is not inheritable if it happens in somatic cells.