I've been composing this for a while, so please forgive any repeat information being posted. I was trying to be thorough!
The victim of the first bomb (3/2/2018, 1112 Haverford Dr, Anthony Stephan House) was the president of his homeowner's association and his wife was an elementary school teacher. Per Travis County tax records, he bought the house in 2010 and he owned it outright. The Washington Post has reported that victim's stepfather,
Freddie Dixon, was good friends with the grandfather (Norman Mason) of the teen who was killed with the second bomb. Freddie Dixon is a former pastor at a historic black church in Austin (Wesley United Methodist Church) and the Masons are members of this church.
The teen victim of the second bomb (3/12/2018, Oldfort Hill Dr, name not yet officially released) was in high school and also played the bass in Austin Youth Orchestra. Though the teen has not formally been identified, the
Washington Post states that the victim's grandfather Norman Lewis Mason is a dentist in East Austin who has mentored African American student-athletes at UT. His wife, LaVonne Mason, is cofounder of the Austin Area Urban League and former Texas Woman's University regent. From
an old article in the Austin American Statesman, she had stated that they had moved to Austin in 1970 - they chose Austin because it was "growing, stable, and could promise nice weather."
The victim of the third bomb (3/12/18, 6706 Galindo St 78741, Esperanza Moreno) lived with her mother and was described by neighbors as a good person who liked to chat and share recipes. The house is owned by Maria "Mary" Moreno outright according to the tax records - they have lived there since at least 1980 and the house was built in 1961. Her husband Theodore (Teodoro) G Moreno had worked as a driver for the state school for the deaf in the 1950s per the city directory. Freddie Dixon has stated that he does not know the Morenos.
Looking through the tax records, there is a woman named Erica Mason who owns 6702 Galindo St - this is two houses removed from 6706 Galindo St. She is approximately 34 years old. I don't know if there is any direct connection to the Mason family of the second bomb, but since this is one of the only two non-Spanish-origin names on this block, I think it's pretty interesting it's a name also associated with the second victim's family.