If the mutations are shared with both your parents and neither of them share the phenotype, it seems unlikely these are major loss of function mutations, however, it would be interesting to know if anyone else on the side of your family with the frame shift shares this trait with you. If you are at all cost sensitive and have some basic lab proficiency, you could easily spot check the relevant region without long read genome sequencing. Just isolate genomic DNA and PCR up the region. Nanopore sequencing (like plasmidsaurus) can sequence the PCR bands for ~15$ would let you see if the mutations are coming from the frame shift copy or not.
If the mutations are shared with both your parents and neither of them share the phenotype, it seems unlikely these are major loss of function mutations, however, it would be interesting to know if anyone else on the side of your family with the frame shift shares this trait with you. If you are at all cost sensitive and have some basic lab proficiency, you could easily spot check the relevant region without long read genome sequencing. Just isolate genomic DNA and PCR up the region. Nanopore sequencing (like plasmidsaurus) can sequence the PCR bands for ~15$ would let you see if the mutations are coming from the frame shift copy or not.