The adjective

1. My friends bought a huge, beautiful house for all (you don't need to use "all" when it's in this context" their family. 
2. I like Msr. (I'm not sure what "Msr." means but I think you would mean "Mrs.") Morgan. She is a the nicest, and most attentive doctor who I've (Could also say, "I have") ever knew known(Knew is present tense) 
3.Next week I am going to go to the IKEA store, there I will what want to buy a coffee table for my living room. 
4. Last winter my husband and I were in Thai for three months, we enjoyed the white sand, and warm sea. It was a long, and wonderful vacation.
5. I have been reading "The Lord of the Rings" it is an interesting book. I bought it one(Could also use, "A") week ago.

Tips:

There are three ways to address people:

Mrs. - Used when referring to a married woman

Ms. - Used when referring to an unmarried woman.

Mr. - Used when referring to a man

I'm not sure if it is just a personal preference but I feel that when using commas to describe things the last comma should be followed by an "And".

Since, "Sand" and "Sea" are plural you would not refer to them with an "a" you would use "the" unless you were talking about a single grain of sand.

The adjective

1. My friends bought a huge, beautiful house for all their whole family.
2. I like Msr. Ms. Morgan. She is a the nicest, most attentive doctor who I have ever known.
3.Next week, I am going to go the IKEA store. there I will what to bay want to buy a coffee table for my living room there.
4. Last winter my husband and I were in Thailand for three months.  We enjoyed a the white sand and the a warm sea.  It was a long, wonderful vacation.
5. I have been reading "The Lord of the Rings."  It is an interesting book.  I bought it one week ago.