My mother bought some finches out of impulse, and now it's

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My mother bought some finches out of impulse, and now it's just depressing. She's ignored the damn things for months now, just changing their water and food when they get dry, never when the water gets dirty (that job falls on me). There used to be three finches, now there's only two, the children of two of those three. These poor fuckers have lived in this cage their entire life, they've never been able to fly around since we have dogs. They're dirty, probably depressed, and at this point we're just waiting for them to die. At one point one of these two is going to die, and the other's just going to waste away alone. I tried talking to my mother about it, but she insists she's taking care of them, but her version of giving them attention is just leaving on the radio. The way I see it, I have three options
1. Poison their water; when their water dish wasn't completely cleaned (on accident) that did the trick on one of them
2. Convince my mother into just letting them go, but I expect her to be stubborn and insist she's taking care of them
3. "Accidentally" release them while she's out of the house.
Thoughts, /adv/?