َ
Eating at ones house:

اللَّهُمَّ بَارِكْ لَهُمْ فِيمَا رَزَقْتَهُمْ وَاغْفِرْ لَهُمْ وَارْحَمْهُمْ

"O Allah, grant him Your blessings in his sustenance, forgive him and have mercy on him”.
Essential
Duas