Good question! The rule of consecutive third tones can be confusing sometimes, but remember the rule of thumb is “no third tone should be together”!
So for this sentence,
nǐ fù mǔ lǐng yǎng nǐ de shí hòu, nǐ duō dà?
We know that [lǐng yǎng] is definitely a grouped phrase, so [lǐng] becomes [líng] -> [líng yǎng]
Now here comes the tricky part, what are we gonna do about [nǐ]?
It’s time to remember the rule of thumb! No third tone can be together, and if there are two third tones together, the first third tone should change into second tone.
So [líng yǎng nǐ] becomes [líng yáng nǐ] ->
nǐ fù mǔ líng yáng nǐ de shí hòu, nǐ duō dà?
When seeing complicated sentences like this, try to figure out which words can be grouped together first, and then use the rule of thumb!
Hope this helps!