Performing venerations for your Ancestors is one of the simplest and most rewarding spiritual practices you can adopt. It is appropriate for any religion (or non-religious persons), even if it is not a concept you are familiar with. Most people will likely find that this practice is more tangible than some others, as the spirits you are interacting with are (most likely) ones that you have known, or are familiar with.
When Ancestors enter the realm of the Spirit world, after having passed from our World, they are in a state of disorientation. Much like you, your ancestors had their own beliefs, desires, traumas, failures and successes, all of which they cling to. Their bodies are left behind but their Spirits remain. Because you are so inextricably linked to them, your Ancestors are able to imprint their own mental impressions upon you. Although Ancestors are said to watch over us, their ability to do so is minimal for those who do not actively call upon and therefore strengthen them. Instead, the more likely result is that their unresolved issues can seep into your life and even plague you with similar afflictions.
For this reason, even if you have reservations about your ancestral family, it is still advisable to connect with them in this way. By acknowledging them, thanking them for their sacrifices, offering them prayers of their birth religion, etc., you are providing them with strength and helping to purify them. In doing so, they reduce your burdens, as the residue they had left on you is cleansed away.
With consistent propitiation, you will quickly see their influence on your life in the most positive sense. Your Ancestors want you to succeed and bring pride to their family name. Your accomplishments are their accomplishments, and your missions are often their missions that they failed to complete while alive. A sincere desire to make your Ancestors proud is in itself a reason why ordinary (non-spiritual) people are provided with so much success, sometimes particularly when a family member has passed on and they intuitively pray to them and ask for their guidance, or they simply want to honour their memory in some way.
Similarly, if the Ancestors are not satisfied with you and you neglect them, you may find that you are plagued with problems, be they material or immaterial. Although they have the ability to grant general successes in life, they are much more powerful in their ability to destroy those descendants who tarnish their good name or who are wasting their lives in offensive ways.
In that same vein, it is important to note that Ancestral practice does not only benefit you and your Ancestors, but also your close living family members. If, for example, you have a sister who struggles with depression or even addiction, with your prayers, the Ancestors will lessen these afflictions on her, especially if they were a holdover from their own lives on Earth.
Ancestral work can be performed either daily or on the same day once a week, but it must be done consistently to provide results. To make a shrine for your ancestors, simply anoint a table with a white cloth, light a candle and offer a glass of water (the water serves as an energetic medium). The table should be adorned with their photos (the photos must not include any living persons), and it may also be decorated with religious symbols of your paternal family. You can pray to them and ask for their guidance and help with any and all personal endeavours. Ancestors can also be appeased by offering them things that they liked in their earthly life, like cigarettes, tea and alcohol. Even if this was part of an addictive behaviour for them, satisfying these cravings can also help eliminate them in yourself or in your family members and will not negatively affect your Ancestors in the same way.
It is important to remember that one day you will also pass on, and if this is already an established practice between you and your progeny, if you find yourself in the realm of the Ancestors, you too can look for the warm glow of an ancestral shrine and the devotional prayers of your children to help guide you on your way.