How do I handle family bullying me about re-homing Mom’s dog??

Mom has been in a nursing home for 2 years. Her dog has spent that time living alone downstairs. I live upstairs on the second floor w my 5 parrots, 15 yr old grumpy cat & a miniature poodle. I’m @ max pet limit!! Mom’s dog is terrified of the parrots. When I did let her dog upstairs, she would hide in a corner under a table in my bedroom. I’m disabled & have several chronic illnesses; Fibromyalgia, CFS, chronic migraine & headaches, Sjogrens Syndrome, Dysautonomia, peripheral neuropathy & more. Family, including mom, decided it was my responsibility to take care of her dog. This responsibility was dumped in my lap. There was no dysfunctional family discussion about it. There were many times I asked siblings & my dad for help. At times I was breaking down in tears. Nobody would help. In Sept I contacted a reputable dog rescue & surrendered the dog. While w the rescue, mom’s dog had excellent care. She saw the rescue’s Vet. Under Veterinary care she had a thorough physical exam, dental, surgery to remove a benign mass from a paw & ear, bloodwork, UA. UA indicated a UTI which was successfully treated. I was able to follow the dog on the rescue’s FB page, plus they personally kept me informed thru the adoption process. The adoption took place 2 wks ago. I wanted to wait for the adoption to occur & give some time for everyone to settle in before I told mom. During that time, I used a “therapeutic lie” once telling mom that dad was still walking her dog once a day. (Parents are divorced.) This happened on the first day after adoption. 2 days after the adoption my dad & a brother put me in a position where I had to go ahead & tell my mom about the rescue, adoption, etc. They are bullies along w the rest of my family. My brother called me w my dad on the line so they could tag team bully me. Both were saying, “how could you do this to mom, why did you do this to mom, you must hate your mother, your mother thinks you hate her”, etc. My dad & siblings have not been honest w mom about her initial diagnosis, health, prognosis, Medicaid rules & more. Everyone in my family except mom knows she is never coming home. This is a “therapeutic lie.” Each person has their own agenda that relates to their inheritance. My agenda was to make this dog’s overall well-being a priority. I was the only person concerned about her emotional, social, physical needs & more. None of these was being met. I couldn’t continue to let her live such a miserable, lonely & isolated life. The situation was adversely affecting my health. I was fortunate to find a breed specific rescue for senior dogs. She is 11yrs old. I’ve seen pics of her new family & home. This is a rags to riches dog story w a very happy ending!! New family took her to a Veterinary Cardiologist who diagnosed her w an enlarged heart & began treatment. She has an upcoming appt to address her allergies. I tried talking to mom about re-homing her dog several times. At one time, I had 3 homes available that would allow me to pick up mom’s dog for a nursing home visit. Even w those options, nobody was willing to do anything or discuss it. I think it’s selfish to waste a dog’s precious life. My family should have been supportive of my decision to surrender mom’s dog especially since they weren’t willing to help or provide a home. This dog wouldn’t have received such thorough & life saving Veterinary care if it was still living downstairs alone. She now has a furever family w lots of love, attention & company. Handling family backlash & hatefulness is a lot more difficult than I expected.