RR still calls us both Mama (posts on that here and here*). Outside of that brief phase a year ago, she has resisted all attempts to assign us names. Unbelievably, people still try to get her to differentiate, mom. She is very adept at using inflection to interact with Debra and me and, if she fails to be understood, she goes with “other mama”.
That could be off-putting, maybe, but we are both other mama from time to time depending on any number of factors. I also think it’s in response to folks trying to help her differentiate while making crafts with our names on them, etc. We sign cards to her as Love, Mamas, we refer to ourselves as mamas, we are totally okay with receiving pictures addressed to mamas (or even one mama). My mother was helping her to make a valentine for us and RR steadfastly refused to differentiate. She finally caved and wrote MAMA and OTHER MAMA. She would not tell my mother who was who.
And that’s totally okay with me.
*Note that RR has still not dropped the habit of occasionally adding a nonsense syllable to the back of a word. While MamaB and its variants evaporated not long after that post, we still sometimes hear tet-tet at the end of a word (or instead of a word.)