Should we grieve the loss of a loved on or celebrate their life- both in my opinion.
To heal from the loss of a loved one we must allow ourselves to grieve. To forbid grieving is to forbid our humanity. This is the only way to healing otherwise one remains stuck. However, it is also a time to celebrate. So, it is both. If people love you, they can't help but mourn your loss while at the same time celebrating the gift you were to them.