The seven (7) letter word is "EDIBLES". "EDIBLES" are foods, goods or an item of foods.
The first sentence is "Mother gives (blank) to children".
In this sentence, "EDIBLES" fits in the sentence because mother`s give goods that is full of nutrition to her children.
The final sentence is "Mother gives edibles to children".
The second sentence is "Father forces (blank) to eat".
In this sentence, "EDIBLES" fits in the sentence because the father is forced to eat foods.
The final sentence is "Father forces edibles to eat".
The third sentence is "Teacher says (blank) to students".
In this sentence, "EDIBLES" fits in the sentence because the teachers want to give a goodies or rewards for his/her students.
The final sentence is "Teacher says edibles to students".
The fourth sentence is "Forest has plenty of (blank)".
In this sentence, "EDIBLES" fits in the sentence because the forest has a lot of foods there.
The final sentence is "Forest has plenty of edibles".