Shabbat is universally about family, and about our relationship to our ultimate, lasting and forever family relationship with Hashem.
Even if we find ourselves alone when we begin the Sabbath, we are not alone. We are part of an enormous and enduring family, and our candle lighting celebrates our family relationship that never ends.
Rabbi Yitzchak Schwartz sent an email to commemorate the 5th Yartzeit of his mother today, and he said:
" Our 'FATHER-IN-HEAVEN' [who is also portrayed as 'IMA' or 'Mother' in certain Providential situations according to the Kabbalah], is Someone that we, His children, can always turn to for help and guidance in any and every situation that we find ourselves in. "