Masbooq completing the missed rakaats before the Imaam makes salaam

Q: A person I know came with me to the Friday prayers. He is not very knowledgeable in Fiqh like myself and we are both non-Aalims. I got out and my companion went to park, but time was running short already, so I managed to find a space, but wasn't sure whether my companion got there on-time. Anyway, I prayed and finished the namaaz. When I got towards the back row I noticed my companion, he pulled me to the side and he was concerned if his prayer was valid, he explained to me the following situation: He came and the Jamaat rose for the 2nd rak'ah, he joined them in the 2nd rak'ah. So when they went into Tashahhud and my companion got up before the Imaam made tasleem, either out of forgetfulness or ignorance, and he quickly managed to finish his final rak'ah and apparently still managed to say the tasleem with the Imaam. He didn't do two prostrations of forgetfulness either. If he neglected to say the Tashahhud out of ignorance as well, would that affect the verdict? What is the verdict anyway?

Moving into a new home

Q:

1. I am soon going to move into my new home. I want to invite my friends and our local Musjid musallees to come to my new home to recite Qur'an and thereafter I will feed them. Is it permissible for me to do so?

2. When one moves into one's new home, what A'maal should one carry out in order to bring blessings in the home?

Questions relating to graves

Q: Please explain the following:

1. Is a grave sacred land?

2. Is it best for it to be flat with no heap of sand rising?

3. Should a grave be unmarked with no plank or name-plate or is it better to have it to help identify where a person is buried?

4. Can flowers etc be planted on a grave?

5. Is there reward in spending money on maintaining a cemetery including removing weeds from the graves?

Premarital relationships

Q: I am 28 years old. I am divorced. My blood relative is 25 years old. We are in love and want to get married. My parents agree and have no issue but his parents do not get agree as they say that the girl is divorced and elder otherwise they have no other issue. We really want to get married and unable to accept anyone else in this relationship. We both are mature and independent. Please tell me that what should we do. We are completely aware of the responsibilities of this marriage. Please help me in this matter.