I make two columns, child below parent, one generation per line. Call your mother Charlotte and her great aunt Alice, for reasons that will be clear, I hope. Make up names for everyone else, too:
Amanda & Alice= sisters Barbara & Bernice = 1st cousins Charlotte & Charles = 2nd cousins Sheri & Daniel = 3rd cousins
It would be neater if you were named Dorothy, but them's the breaks.
Now, although you didn't ask, this is handy for those removed, too. You draw a lne up and over, like an "L" turned on its side. The line from you to "Charles", for instance, goes up to your mother Charoltte and over to the right. Charles is your second cousin once removed through your mother.
"Bernice" is your first cousin twice removed, because the line goes up two generations, to "Barbara", before it turns right.
Back to your mother, "Charlotte". Charlotte's grand aunt is Alice. Alice's grandson is Charles. Charlotte and Charles are second cousins. When he has children, they will be your third cousins.