What would your children have to do in order that you would starve them to death. Just give me a little example with context of course.
If my 30-year old or 28-year old children decided that they didn't want to have anything to do with me and/or their mother (unlikely in our case, thankfully) there would be nothing for us to do as their parents, other than to be available should they change their minds. Or are you suggesting that we, as parents, should interfere in their lives?
Your attitude towards your own children seems to have no relevance whatever to Leviticus 26:29, or even to the whole chapter.
The chapter, it seems to me, can be divided into three parts:
The first part is about how the Israelites should conduct themselves in accordance with God's edicts, and how He will reward them with the wherewithal to have a good life.
The second part(which is by far the longest) deals with the punishments which God will mete out if His laws are not obeyed. The theme running throughout this section(and which includes said verse) constantly emphasises the deliberate acts that He will perform to make their lives as miserable as possible, including pestilence, starvation and war. He even suggests that if they do not come to their senses, then He will punish them even more severely by devastating their lands and cities and scattering the remainder throughout other lands. In fact there seems to be a theme of hate running throughout this section.
God does however suggest, towards the end of the chapter that for those few that are left, if they recant their 'iniquities' and accept the punishments that He meted out, then He will renew his covenant with them and they will be no longer rejected.
Now, from my position, this simply illustrates the savagery that was part of those times when everything, including war, famine, disease etc. was attributable to a god or gods.
However, I fail to see how your idea of a parent who either helps or, at least, doesn't interfere in the life of a wayward child has anything to do with a God who, according to this chapter, threatens to interfere by using vicious and appalling punishments for those who go against Him.