Re: No mercy shown by relatives...
STP, I would invite the same family to dinner at my house and give them the excellent 5 star service I received as their guest! Hopefully, they should get the message! Otherwise, you could always ask them to pack the food in your plate for later as you don't like eating a huge meal before isha/tarawee.
Subbo perhaps you could also return the favor to your aunt by inviting her to your house instead of visiting her?