Can we still reach loved ones with guidence after they have passed through the bardo into a rebirth? The question I pose is the same as the title of this post. Any experience or further reading of how to practice this reaching of a loved one to support and guide them after they have passed through the bardo into rebirth.

Thank you

What I mean by reaching....is, I suppose after reading the post below by bhumishu; to send a blessing. Is this received? Now even another question....I have read that there are 49 days in the bardo and the first day is equal to four days which in total will be 52. All of which are merely symbolic. Can someone or you please expound on this? Also, I do have a copy of The Tibetan Book of the Dead which will need to be opened and read again and refereed to again for retained wisdom. Any and all acceptance that can be given that I was unable to be there to guide my Grandmother within the 49 or 52 day time frame according to the practices given in the teachings. This is why I deeply want to assist or send blessings to her that are received by her in whatever or wherever she may be now. Thank you so much!
"Can we still reach loved ones with guidence after they have passed through the bardo into a rebirth?"

If "guidance" you refer to what the book "Tibetan Book of The Death" instructed, then it would be "no". That person is in a new life form, all the possibilities during the bardo stage is conclusive now. In general saying, the bardo lasts max. 49 days. However, you may send blessings to the loved ones any time.