My stutter started to become noticeable when I was around 4-5 years old, and became really bad when I was about 9. Also when I was around 4-5 years old was when I remember the relationship between my parents being at its absolute worst. We used to live also with my grandma, who loved me more than anything and who was my refuge when things between my parents got violent. But when I was around 9 she passed away and I was left alone with my parents and their permanent fighting. So, yes, I do see the correlation between breaking points with toxic relatives and the aggravation of stuttering.