How do Muslims Honor their Deceased Love Ones?

In the Name of Allah, The Beneficent, The Merciful

The most important acts one can do to truly keep honoring one's relatives who left them to the unseen world are the following acts.

• Continuous du'as (supplications) of forgiveness by Allah (SWT) and admittance to Jenna (Garden of Eden) for their loved ones.
• Frequent salat and FatiHa reading on behalf of the loved one.
• Acts of perpetual unending charities (such as planting trees, assisting in building masjids and schools, etc.) are amongst the noblest of acts a surviving relative ought to do on their beloveds' behalf.
• Spreading knowledge the loved ones had imparted so that they benefit from their eternal reward.
• Continually honoring the friends and relatives of one's beloveds is yet another means of honoring them.
• Continuing to support the good causes the loved ones were passionate about would be beneficial too.
• Performing Hajj or completing their unfulfilled days of seyam Ramadhan on their behalf would be commendable.
• Pay the debts of one's beloveds if they did not leave a wayssiya (a will to stipulate that it be paid.) 

The above list is not by any means a comprehensive full list; it is meant as a starter for all good things one can do to truly honor one's beloveds. The wider the reach of the acts to other human beings the greater the reward shall be for the deceased. The acts are more meaningful and more far reaching the closer the relative is to the deceased. The surviving children, spouse, parents, and siblings are expected to shoulder this noble responsibility the most and from a position of deep and genuine love to their departed relative.