I’ve explained multiple times in this very thread how and why sentience is relevant to moral consideration, you’re just ignoring it. Not sure if you aren’t capable of understanding it or if you just disagree due to bias. And based on the history of our exchanges, you don’t like to concede any points you personally disagree with.
By encouraging you to connect factors like race, gender, and sexual orientation to moral value I’m trying to drive home the point the they are all irrelevant. You haven’t even attempted to do this, so you either agree or don’t have a good enough response.
Taking an individuals interests into consideration means understanding that nonhuman animals can be harmed and benefited, and avoiding actions that cause unnecessary suffering.
The demonstrated interests of nonhuman animals (like a desire not to be harmed) can be evaluated by their related behavior in reaction to positive and negative stimuli (and in their responses to operant conditioning).
http://fcmconference.org/img/CambridgeDeclarationOnConsciousness.pdf
If the animal is sentient then they can be harmed or benefited. Their interests to avoid harm can be violated. This isn’t the same as saying if an animal sentient then it can feel pain. Or that all sentient beings feel the same kind/degree of pain.
I assume you mean "moral value" here. Why? You should justify why sentient non-human animals with intrinsic value should only be given “indirect rights.”
Where do you think rights come from? And again, do you agree with the OP’s friend that children are only to be given rights by virtue of their relationship with "human society" i.e. their parents? If so, why??