Blessings to be done in Latin only: Fr. Z on his blog notes that in order for a blessing to be valid using the traditional rite of 1962, the blessing must be said by the priest in Latin. If it’s done in English, it’s invalid: https://wdtprs.com/2021/02/ask-father-if-a-priest-blesses-something-without-following-the-ritual-is-it-really-blessed-bad-news/