I don’t think I understand the statement in Mosiah 15:2 And because he dwelleth in flesh he shall be called the Son of God, and having subjected the flesh to the will of the Father, being the Father and the Son. Can you explain these in easy terms.
Thank you for your question. The simplest form I could explain this is by using the institute manual and quote it verbatim.
Also, let’s review Mosiah 15:1-7;
1 And now Abinadi said unto them: I would that ye should understand that God himself shall come down among the children of men, and shall redeem his people.
2 And because he dwelleth in flesh he shall be called the Son of God, and having subjected the flesh to the will of the Father, being the Father and the Son—
3 The Father, because he was conceived by the power of God; and the Son, because of the flesh; thus becoming the Father and Son—
4 And they are one God, yea, the very Eternal Father of heaven and of earth.
5 And thus the flesh becoming subject to the Spirit, or the Son to the Father, being one God, suffereth temptation, and yieldeth not to the temptation, but suffereth himself to be mocked, and scourged, and cast out, and disowned by his people.
6 And after all this, after working many mighty miracles among the children of men, he shall be led, yea, even as Isaiah said, as a sheep before the shearer is dumb, so he opened not his mouth.
7 Yea, even so he shall be led, crucified, and slain, the flesh becoming subject even unto death, the will of the Son being swallowed up in the will of the Father.
So, in the 3rd verse he actually answers your question by saying that He’s the Father because “he was conceived by the power of God” and the Son because “of the flesh“.
The Institute Student Manual explains like this:
Sometimes the scriptures refer to Jesus Christ by using the title “Father.” Elder M. Russell Ballard explained why Jesus Christ is sometimes referred to as both the Father and the Son:
“How can Jesus Christ be both the Father and the Son? It really isn’t as complicated as it sounds. Though He is the Son of God, He is the head of the Church, which is the family of believers. When we are spiritually born again, we are adopted into His family. He becomes our Father or leader. …
“In no way does this doctrine denigrate the role of God the Father. Rather, we believe it enhances our understanding of the role of God the Son, our Savior, Jesus Christ. God our Heavenly Father is the Father of our spirits; we speak of God the Son as the Father of the righteous. He is regarded as the ‘Father’ because of the relationship between Him and those who accept His gospel, thereby becoming heirs of eternal life. And the third member of the Godhead, God the Holy Ghost, has the specific mission to teach and to testify of truth as it pertains to the divinity of both God the Father and God the Son” (“Building Bridges of Understanding,” Ensign, June 1998, 66–67).
and then we read;
On June 30, 1916, under the leadership of President Joseph F. Smith, the Brethren set forth a detailed statement on the Father and the Son entitled “The Father and the Son: A Doctrinal Exposition by the First Presidency and the Quorum of the Twelve Apostles.” A portion of this exposition explains how Jesus Christ is identified in the scriptures as both the “Son” and at times as the “Father”:
“‘Father’ as Creator. … Scriptures that refer to God in any way as the Father of the heavens and the earth are to be understood as signifying that God is the Maker, the Organizer, the Creator of the heavens and the earth.
“With this meaning, as the context shows in every case, Jehovah, who is Jesus Christ the Son of Elohim, is called ‘the Father,’ and even ‘the very Eternal Father of heaven and of earth’ [see Ether 4:7; Alma 11:38–39; Mosiah 15:4; 16:15]. …
“Jesus Christ the ‘Father’ of Those Who Abide in His Gospel. [Another] sense in which Jesus Christ is regarded as the ‘Father’ has reference to the relationship between Him and those who accept His gospel and thereby become heirs of eternal life. …
“To His faithful servants in the present dispensation the Lord has said, ‘Fear not, little children, for you are mine, and I have overcome the world, and you are of them that my Father hath given me’ (D&C 50:41). …
“Jesus Christ the ‘Father’ by Divine Investiture of Authority. … Jesus the Son has represented and yet represents Elohim His Father in power and authority. … Thus the Father placed His name upon the Son; and Jesus Christ spoke and ministered in and through the Father’s name; and so far as power, authority, and godship are concerned His words and acts were and are those of the Father” (“The Father and The Son,” Ensign, Apr. 2002, 14–15, 17).
I hope this helps,