After I got my first firearms license, I couldn't wait to get a snubby on which to put some t-grips. I thought the finish and profile of older pistols are preferable, but didn't think I'd take to the slim wood grips that usually accompany them. Yet, when I got my first j-frame, I learned that there isn't any space left by my hand where the t-grip is supposed to affix when holding the gun. And I don't have "large" hands by any means.
I wonder how small one's hands have to be to fit in between the t-grip and what's left behind the trigger guard of a small frame pistol. A child's hand, perhaps? Or may be they'd work better on medium/large framed revolvers, such as the Speed Six.
Just thought I'd share that in case the OP hadn't thought through how suitable the grip is for Tylers, given his hand size.