Here is a simple, emotional speech you (as a brother) can give for your sister’s diksha. Adjust names and relations as needed.

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Respected Gurudev / Sadhvijis, elders, and dear family members, Jai Jinendra.

Today is the most special and emotional day of my life. My beloved sister, who grew up holding my hand, playing with me, fighting with me, and loving me, is now going far beyond all worldly relations and walking on the path of Bhagwan Mahavir – the path of diksha.

As a brother, my heart has two feelings together: – On one side, there is pain, because from today I will not be able to call her “meri behen” in the same worldly way. – On the other side, there is deep pride and joy, because from today she belongs not just to our family, but to the entire world, to every jiv, as a true follower of Jain Dharma.

Sister, since childhood I have seen in you: – compassion (daya) for every small living being, – patience in every situation, – and deep faith in Jain Dharma.

Maybe we did not understand it fully then, but today we can see that all those sanskars were preparing you for this great step of diksha.

In Jainism, diksha means: – to leave attachment (raag) and hatred (dvesh), – to leave “mine–yours” (mamta), – and to live only for the purity of the soul.

You are accepting a life of ahimsa, satya, aparigraha and tapas. You are choosing thorns over flowers, discipline over comfort, and moksha-marg over worldly happiness.

As your brother, I want to say this from my heart:

Sister, today you are not going away from us, you are actually lighting a lamp for us. When we see you in the white clothes of a sadhvi, we will be reminded to control our anger, our greed, our ego, and to live a purer life.

We promise you: – We will not cry in a way that creates bondage (bandhan) for you. – We will convert our dukh into bhav of punya. – Whenever we remember you, we will try to follow at least one small Jain principle more sincerely – maybe it is eating before sunset, practising ahimsa in food, doing pratikraman, or reducing our attachment.

From today, you are moving from “ghar” (home) to “dharma” (eternal home). From being my sister, you are becoming a daughter of Jinshasan.

On behalf of our whole family, I bow at your feet. May your every step on this path burn karmas and take you closer to keval gyan and moksha. If ever, knowingly or unknowingly, I have hurt you in childhood or later – by words, actions or even thoughts – please forgive me.

Michhami Dukkadam. Jai Jinendra.

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You can shorten or expand this, add personal memories (childhood incidents, how she was inclined to dharma, etc.), and include your sister’s name and your guru’s name to make it more personal.