How are twin offspring charted?

Question

How are twins indicated in FAMILY ECHO? Other charting keys use two lines coming from a single point in the horizontal line between parents/partners that spreads at a 45° angle? Maybe some visual to differentiate identical vs. fraternal?
I am the father of identical twins. But there are several fraternal twins in my relations and one other identical. I've been taught only fraternal are genetic (not considering in vitro fertilization) and identical is more or less random. See, I feel preserving these facts in the chart will serve a purpose on through the future generations

Answer 1

I have put people with the same birthdate into my family tree, and nothing has automatically happened. I don't know if there is a way to manually enter this in, but you could always go to "biographical" and put "fraternal twin to so-and so" in the bio notes.