Couples That Have A Baby At A Young Age [13-17]

People Say That Supposely Brothers or Sisters That Are 3-4 yrs apart Have A Harder Time Getting ALong Because 'Theyre From Different Generations'. But If You Have A Baby At Around 13-17 And Had Then About 9 Months Apart Do You Think They Wont Fight? Do You Believe In This Generation Nonsence? How Do You Think It Would Be? Do You Think It Would Be Different With Twins? They'll Be Born In The Same Generation Just Different Times Will They Get Along Then?