How can we dedicate our sympathy to the family of diseased one ?

Being a healthcare professional, I would say the best way to show sympathy is to show empathy. Stand by their side, encourage them to kind words, be part of their grief, extend help in which ever way you can, be calm and loving, comfort them.

Spend time with the grieving family. Speak words of encouragement. Love is empathetic... Don't be careless with what you say. If it's not necessary to speak, just keep quiet.

There are many different ways to find comfort when grieving. · Religious or spiritual beliefs may also help by lending larger meaning to a loved one's life and death.

Thanks for Sharing good information

I have seen many people calling the family members to show grief,

We can always offer prayers sincerely

You can also write a short note and tell the family how you spent time

I have seen many people calling the family members to show grief, I personally hate this thing. If you really want to sympathize for them, you need to show up. (It doesn't apply if you are living far away) But try to avoid "virtual" things when it comes to emotions.

by take caring his/her family after his/her death.

Religious or spiritual beliefs may also help by lending larger meaning to a loved one's life and death.

It's important to the friend of the family who lost the loved one to be able to show sympathy. One way (if you live nearby) is to take over a cooked dish or a platter of vegetables since there is so much company to feed. If you live far away, instead of sending cut flowers send a living plant. You can also write a short note and tell the family how you spent time with the deceased...what you remember about their loved one.

by participating in the funeral we can show our love for that family. and pray for diseased one also.

There are many different ways to find comfort when grieving. · Religious or spiritual beliefs may also help by lending larger meaning to a loved one's life and death.