I am going through grief myself right now. Unless you are given instruction from your meditation teacher, I recommend that you continue with your usual object of meditation. I also recommend that you incorporate metta bhavana as an adjunct. In the past I have found that spending some time per day practicing metta, on top of my vipassana practice, has eased my grief.
I am sorry for your loss and I wish you all the best.
“No lists of things to be done. The day providential to itself. The hour. There is no later. This is later. All things of grace and beauty such that one holds them to one's heart have a common provenance in pain. Their birth in grief and ashes.”
- Cormac McCarthy, The Road
Learn this from the waters:
in mountain clefts and chasms,
loud gush the streamlets,
but great rivers flow silently.
- Sutta Nipata 3.725Compassionate Hands Foundation
(Buddhist aid in Myanmar) • Buddhist Global Relief