Brianne completes 8 rows of stitches on the first day. She adds 8 more rows of stitches each day. Tristian completes 4 rows of stitches on the first day. He adds 4 more rows of stitches each day.
On the second day, Brianne completes 8 + 8 = <<8+8=16>>16 rows of stitches.
On the third day, Brianne completes 16 + 8 = <<16+8=24>>24 rows of stitches.
On the fourth day, Brianne completes 24 + 8 = <<24+8=32>>32 rows of stitches.
On the fifth day, Brianne completes 32 + 8 = <<32+8=40>>40 rows of stitches.
On the second day, Tristian completes 4 + 4 = <<4+4=8>>8 rows of stitches.
On the third day, Tristian completes 8 + 4 = <<8+4=12>>12 rows of stitches.
On the fourth day, Tristian completes 12 + 4 = <<12+4=16>>16 rows of stitches.
On the fifth day, Tristian completes 16 + 4 = <<16+4=20>>20 rows of stitches.
Brianne completes a total of 8 + 16 + 24 + 32 + 40 = <<8+16+24+32+40=120>>120 rows of stitches.
Tristian completes a total of 4 + 8 + 12 + 16 + 20 = <<4+8+12+16+20=60>>60 rows of stitches. Answer: \boxed{60}.