Quoting Commentary for I Samuel 4:21

אל שרה אשתו OF SARAH HIS WIFE — means in reference to (אֶל in sense of עַל) just as (1 Samuel 4:21) “in reference to (אל) the ark of God being taken, and in reference to (אל) her father-in-law”, where the word אל, in both cases, has the same meaning as על.

It would not be possible - [The word] אי [is vowelized] with a tzeirei (".." - pronounced "aye") under the alef since that word comes from the word אין [which is spelled with a tzeirei under the alef and means "not"]. This is the opinion of the Be'er Heitev and the Pri Megadim. Shaarei Teshuva says it should be vowelized with a chirik ("."), for here too the intention is that [the word אי with a chirik - pronounced "ee"] is similar [in meaning] to where it's written [in I Samuel 4:21] "אי כבוד" ("Ee-Chavod"), and Rashi comments there that the intention is that it's like אין כבוד (which means "there is no glory").

He shall deliver one who is not innocent Heb. אי נקי, synonymous with אין נקִי, not innocent, like (I Sam. 4:21), “Ichabod (איכבוד),” meaning, there is no glory (אין כבוד). And so (Prov. 31:4), “neither is drunkenness for rulers (אי שכר),” there is no drunkenness (אין שכר). It does not befit them to become intoxicated. Menachem joined the three into one group (Machbereth Menachem p. 22). Although they are two words (?), they explain them thus. And that one who is not innocent will be delivered because of the purity of your hands. So I heard. I heard another version that was being said in the name of Rabbi Jacob: This is an expression of a man who lives in pain and sighing, and the “yud” is superfluous in the word, like (Ps. 123:1), “Who dwells (הישבי) in heaven.” But I did not hear this from the rabbi’s mouth.

ארד אל בני I WILL GO DOWN TO MY SON — This has the same meaning as על בני, on account of my son. There are many examples where אל is used in the sense of על: (2 Samuel 4:21) “(אל) because of Saul (ואל) and because of his bloody house”; (1 Samuel 4:21) “(אל) because the ark of God was taken (ואל) and because of the death of her father-in-law and her husband”.