Is it allowed to delay the funeral for one or two days because some of the close relatives come from overseas?

Some people say that if you delay the funeral, the deceased will suffer the pain because his actual house is the grave now.

The scholars have stated that there is no harm in delaying the burial for a valid reason like waiting for the arrival of relatives and so on (Summary of Islamic Jurisprudence). When the Prophet (ﷺ) died, he was not buried immediately but he was buried after two days. 

And Allah knows best.