Naomi knew Boaz was a relative:
Rth 2:20 "May the LORD bless Boaz!" Naomi exclaimed. "The LORD always keeps his promises to the living and the dead." And she went on, "That man is a close relative of ours, one of those responsible for taking care of us." [GNB]
Naomi also knew the Law about Levirite marriages :-
Deu 25:5 "If two brothers live on the same property and one of them dies, leaving no son, then his widow is not to be married to someone outside the family; it is the duty of the dead man's brother to marry her.
Deu 25:6 The first son that they have will be considered the son of the dead man, so that his family line will continue in Israel.
Deu 25:7 But if the dead man's brother does not want to marry her, she is to go before the town leaders and say, 'My husband's brother will not do his duty; he refuses to give his brother a descendant among the people of Israel.'
Deu 25:8 Then the town leaders are to summon him and speak to him. If he still refuses to marry her,
Deu 25:9 his brother's widow is to go up to him in the presence of the town leaders, take off one of his sandals, spit in his face, and say, 'This is what happens to the man who refuses to give his brother a descendant.'
Deu 25:10 His family will be known in Israel as 'the family of the man who had his sandal pulled off.'
Boaz was most touched by Ruth's offer of Levirite marriage as her husband had died but left her childless and she was related to Boaz:-
Rth 3:10 And he said, Blessed be thou of the LORD, my daughter: for thou hast shewed more kindness in the latter end than at the beginning, inasmuch as thou followedst not young men, whether poor or rich. [KJ]
This is more understandable in a modern version:-
Rth 3:10 "The LORD bless you," he said. "You are showing even greater family loyalty in what you are doing now than in what you did for your mother-in-law. You might have gone looking for a young man, either rich or poor, but you haven't. [GNB]
The Bible does not say how old Ruth and Boaz were, but implies that Boaz is somewhat older than Ruth. However, according to Jewish tradition Boaz was then eighty years of age, and Ruth forty. (See Midrash Ruth, fol. 31. 4. & 34. 2.)
Boaz died after he married Ruth, and had a child as well but when he died the bible does not say.
Boaz (Ruth 4:13)
Tradition states that Boaz (Ruth's second husband) survived only a short time after he and Ruth were married.
Ruth's first husband was Mahlon, son of Naomi. After he died, Ruth came to Israel and married his relative, Boaz .
Ruth
Boaz .
Yes (Ruth 4:10)
Orpah and Ruth married Machlon and Kilyon, but who married whom exactly is not specified (Ruth ch.1). The order of the names, if taken respectively, implies that Ruth's first husband was Kilyon, not his brother Machlon. Her second husband was Boaz (Ruth ch.4).
Ruth's second husband was Boaz. He was a wealthy landowner who showed kindness and generosity towards Ruth and her mother-in-law Naomi. They later married, following Jewish customs.
Boaz is the grandfather of Jesse ( Yishai, king David's father ). See the fourth chapter of Ruth.
We know very little of Kilion (Ruth's husband) from the narrative and certainly not enough to know if he and Boaz were close friends. However, since Boaz was very familiar with Naomi, Kilion's father, it stands to reason that they were probably friendly, but there is no certainty in this.
Ruth's first husband was Mahlon, son of Naomi. After he died, Ruth came to Israel and married his relative, Boaz .