Hi S.
Twins are so much fun.
My twins are grown now, but oh the stories I can tell. And love to tell so if they can email I would love to do that.
My potty training story is this.
We used 2 potty chairs, and the toilet add on seat as well.Training was one thing we did together even though the younger was not as interested as the older, but she caught on quickly. They both trained at about 2. When the older twin climbed on the toilet with no add on, not a problem the other just climbed on too, back to back.
The older one was trained first; since I would talk about big girl pants, she said "I big girl, you a baby" to her twin sister one minute younger. Needless to say we went to pull ups for the younger twin for a month or so, and I had a great laugh.
With all 4 I was careful not to miss the signs they were ready because my mom would say if you miss the signs of readiness, children are much harder to train. I found that so when I worked at the day care and so many 3 and 4 yo were untrained.
God bless you & especially for asking for your brother's family
K. SAHM married 39 years --- adult children 38,33,and 19