Yes, both sentences are grammatically correct.
1. **"They will always get upset if you don’t bend to their rules."** - This means that if you do not comply with or follow the rules set by "them," they will consistently feel upset or displeased.
2. **"They will always get upset if you don’t bend to their wish."** - This indicates that if you do not fulfill or comply with what they desire or wish for, they will similarly feel upset or