If your loved ones were buried according to the canons of religion (got memorial service of Pannikhida) then their Souls fall into this religion slavery, that is the Soul becomes de-energized. It is very dangerous. The next incarnation of such soul will be with mental or physical illness .
It is important to remove the cross of suffering and read this prayer for the deceased one subjected to Pannikhida.
Light a black candle and read:
«I remember with a good word (name), I remember, I reject the religious evil whatever.
May the religious evil leave my ancestors spirits forever.
Read 9 times.
Try to let the candle burn out.