Mother was buried on April 5th, the day after Tomb-Sweeping Day. What are the taboos in dog days?

There is no taboo, relax, don't be suspicious, no matter who it is, it will always die without regret, rest in peace. The grief of mother's death is extraordinary and understandable. A word of advice: when erecting tombstones in the future, don't stand in the south direction, which will affect the luck of the younger generation. You can stand in the direction of due north, southwest and southeast. Trust me, just do it and you will benefit. Don't follow local customs, because few masters really understand the secrets of Feng Shui.