Dependency of an element on the implementation of a child element, is it acceptable according to BEM?

Question

BEM

<div class="content">
       <div class="content__text-block">
          <div class="content__head">Крупный текст</div>
          <div class="content__desc">обычный текст</div>
        </div>
</div>

.content
   &__text-block
      font-size: 1.2rem
   &__head
      font-size: 2em
   &__desc
      font-size: 1em

Is it correct according to BEM if the font size of an element depends on the implementation of the parent element?
Or is it necessary to make the text-block element a block in such cases?

Answer 1

Well, firstly, you need to work on the semantics in html. Team div-yank is not cool at all.
Here are two implementation options:
1)

<section class="content">
  <div class="content__text-wrap">
    <h2 class="content__title">Заголовок</h2>
    <p class="content__descr">Блок с текстом</p>
  </div>
</section>

2)

<section class="content">
  <div class="content__text-wrap article">
    <h2 class="article__title">Заголовок</h2>
    <p class="article__descr">Блок с текстом</p>
  </div>
</section>

And about the font size: there is not much difference, it all depends on the context. Don't forget modifiers. You can type this way and that and awry.