Death and Mourning

Question about having an aliyah during shiva week chabad.org states that the mourner may not be called to recite the blessing over the Torah reading (Aliyah). My rabbi also follows that standard. If husband dies and leaves his wife, daughter and son-in-law, and grandson, am I correct that only the wife and daughter would be considered the mourners? If so, the wife and daughter would not receive an aliyah during the shiva week. Could the son-in-law or the grandson have an aliyah during the shiva week?

Moses died on the seventh of Adar. The Talmud proves this as follows- 1. In Deuteronomy 34:8 we read that the Jews mourned for thirty days following Moses' death. 2. The book of Joshua begins with G‑d's command to bring the Jewish people across the Jordan River. G‑d specifies that they are to cross in three days time. This instruction was given immediately after Moses died, meaning at the earliest possible opportunity after his death. This would have been following the thirty days of mourning. 3. In Joshua 4:19 we are told that the Jews crossed the river on the tenth of Nissan. If we subtract the three days between the command and actual crossing, plus the thirty days of mourning, we find the date of Moses' passing is the seventh of Adar. Your answer to one of my previous questions was that the month of ADAR always has 29 days, except when there are two months of Adar, then the first one always has 30 days. My understanding is that Sheloshim for 30 days starts after burial. Am I correct that Moses died and was buried on the same day? Did the Jews start mourning for Moses on the same day as he died? Thanks.

When a close relative passes away, which relatives should tear clothing? If one is wearing a suit, which piece of clothing should be torn, the shirt or the suit jacket?

My mother's yahrzeit is Adar 13 (right before Purim) but this year there are 2 Adars, and so when should I light the candle: Adar 1 or 2?

My mother passed away in September of 2015 and is interred in an above-ground vault. I know it is customary to mark a grave 1 year after the burial with an unveiling. However, I have read that waiting the year is done to allow the ground to settle before placing a headstone or marker so it doesn't sink. Since she is not in the ground, is it still appropriate to wait 1 year or can it be marked sooner?